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Hitachi Lightning 9900™ User and Reference Guide vii
Contents
Chapter 1 Overview of the Lightning 9900™ Subsystem
1.1 Key Features of the Lightning 9900™ Subsystem............................ 1
1.1.1 Continuous Data Availability ..................................... 2
1.1.2 Connectivity.................................................. 2
1.1.3 S/390
®
Compatibility and Functionality............................. 3
1.1.4 Open-Systems Compatibility and Functionality....................... 3
1.1.5 Hitachi Freedom NAS™ and Hitachi Freedom SAN™.................... 4
1.1.6 Program Products and Service Offerings............................ 6
1.1.7 Subsystem Scalability........................................... 8
1.2 Reliability, Availability, and Serviceability................................ 9
Chapter 2 Subsystem Architecture and Components
2.1 Overview ..........................................................11
2.2 Components of the Controller Frame ....................................14
2.2.1 Storage Clusters...............................................14
2.2.2 Nonvolatile Shared Memory......................................15
2.2.3 Nonvolatile Duplex Cache .......................................15
2.2.4 Multiple Data and Control Paths ..................................16
2.2.5 Redundant Power Supplies.......................................16
2.2.6 Client-Host Interface Processors (CHIPs) and Channels.................16
2.2.7 Channels ....................................................18
2.2.8 Array Control Processors (ACPs) ..................................19
2.3 Array Frame........................................................21
2.3.1 Disk Array Groups..............................................23
2.3.2 Sequential Data Striping ........................................24
2.4 Intermix Configurations...............................................25
2.4.1 RAID-1 & RAID-5 Intermix........................................25
2.4.2 Hard Disk Drive Intermix ........................................25
2.4.3 Device Emulation Intermix.......................................26
2.5 Service Processor (SVP)...............................................27
2.6 Remote Console PC ..................................................27
Chapter 3 Functional and Operational Characteristics
3.1 New 9900 Features and Capabilities .....................................29
3.2 I/O Operations......................................................29
3.3 Cache Management ..................................................30
3.3.1 Algorithms for Cache Control.....................................30
3.3.2 Write Pending Rate ............................................30
3.4 Control Unit (CU) Images, LVIs, and LUs..................................31
3.4.1 CU Images ...................................................31
3.4.2 Logical Volume Image (LVIs) .....................................31
3.4.3 Logical Unit (LU) Type..........................................31
3.5 System Option Modes.................................................32